As a boatload more people use Google to search for results than Bing could ever possibly dream of,…
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Google Fellow Singhal described how they discovered Microsoft's Bing search engine was copying their spelling corrections and top search results:

"We noticed that URLs from Google search results would later appear in Bing with increasing frequency for all kinds of queries: popular queries, rare or unusual queries and misspelled queries. Even search results that we would consider mistakes of our algorithms started showing up on Bing."

or possibly some other means to send data to Bing on what people search for on Google and the Google search results they click. Those results from Google are then more likely to show up on Bing. Put another way, some Bing results increasingly look like an incomplete, stale version of Google results-a cheap imitation."

Microsoft has already stated that "we do not copy Google's results," but is that just a clever way for them to dodge the spelling-correction bullet? [Official Google Blog]